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Excitation spectra of transition-metal atoms on the Ag (100) surface controlled by Hund's exchange.
Gardonio, S; Karolak, M; Wehling, T O; Petaccia, L; Lizzit, S; Goldoni, A; Lichtenstein, A I; Carbone, C.
Afiliación
  • Gardonio S; Materials Research Laboratory, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia.
Phys Rev Lett ; 110(18): 186404, 2013 May 03.
Article en En | MEDLINE | ID: mdl-23683227
ABSTRACT
We report photoemission experiments revealing the valence electron spectral function of Mn, Fe, Co, and Ni atoms on the Ag (100) surface. The series of spectra shows splittings of higher energy features which decrease with the filling of the 3d shell and a highly nonmonotonic evolution of spectral weight near the Fermi edge. First principles calculations demonstrate that two manifestations of Hund's exchange J are responsible for this evolution. First, there is a monotonic reduction of the effective exchange splittings with increasing filling of the 3d shell. Second, the amount of charge fluctuations and, thus, the weight of quasiparticle peaks at the Fermi level varies nonmonotonically through this 3d series due to a distinct occupancy dependence of effective charging energies U(eff).
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Bases de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2013 Tipo del documento: Article País de afiliación: Eslovenia
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Bases de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2013 Tipo del documento: Article País de afiliación: Eslovenia